That's why it needs to be someone who provides more options for varying team shape. Rodri has the passing, shooting, positioning, and presence to play further up the pitch. Sure, mobility-wise he's lacking, but for certain games a unit like Rodri farther up the pitch or playing as an 8 could be an asset.
If we bring in a young, mobile, dinho-esque dm then you could play a double pivot (hasn't worked before, but the false nine took a while to work too), maybe you could push Rodri forward like we used to do with Dejong for Yaya (no way am I saying Rodri is the same kind of player, just spitballing). Or even, a young DM could play in the 8 like fernandinho has in the past.
Having players who play multiple positions is how you keep everyone happy.